Yes I can, although they dont really need debunking
They are a series of intentionally bad movies made by butchykid (or butchykid624) who is the proud owner of "no budget productions". (butchy kid films). His modus operandi is to seed video sharing sites (like youtube) with his own particular brand of comedy, usually poking fun at ghosts UFOs aliens and sasquatch footage.
Looks to me like they were trying to film a scary scene in poor light, with the subject unable to see well as he's wearing a mask. So he kept missing his footing on the stairs and sliding down on his arse - made me laugh! ;D